William sellers



(No Model.)

W. SELLERS.

PUMP.

. Patented Dec; 12. 1882.

Wflhesses."

I 11, mentor N. PETERS. Photo-WWW". Wixhingtun, D. (I.

a i UNITED STATES PATENT 0FFICE..

IVILLIAM SELLERS, OF PHILADELPHIA, PENNSYLVANIA.

PUMP.

SPECIFICATION forming part of Letters Patent No. 268,832, dated December 12, 1882, A

Application filed February 27, 1882.

T 0 all whom it may concern:

Be it known that 1, WILLIAM SELLERS, of the city and county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Double-Acting Pressure-Pu1nps, ofwhich the following is a specification.

Myinvention relates to that class of doubleacting pressure-pumps that are provided with two valves only-one for the admission of water and the other to shut off the pressure from the admission-valve while this latter is taking water. All such pumps as heretofore constructed have been provided with a plunger and a solid piston, the plunger being half the area of the piston, afoot-valve to admit water at one end of the cylinder, a passage outside the cylinder which connects the admission end with the discharge-pipe, and a check-valve in this passage; and the operation is such that one-half the contents of the cylinder is discharged at each movement of the piston from one end of the cylinder to the other. In all such pumps the plunger and its piston are packed in some way to prevent the leak or escape of the fluid. In service, especially under high pressures, these packings wear rapidly from the continued friction of the moving parts and from the grit usually carried by the fluid pumped, and frequent adjustments or renewals of the packing and reseating of the valves are therefore necessary. As the pumping machinery must be stopped during such renewal, the time lost is usually considerable, for in most cases it is necessary to break several joints, either in the pump or connectingpipes, to get at the parts requiring repair, which joints must be carefully repacked in putting the pump together.

The object of my present invention is to simplify the construction of such pressure-pumps, so as to diminish the cost of manufacture and tofacilitate the renewal and repair of packings and valves; and to these ends my invention consists in providing a check-valve passage throughthe pistou,and combining such piston with a cylinder secured at one end to a discharging-chamber and provided at the other with an inlet valve and pipe so arranged that the cylinder may be passed or telescoped over,

the inlet-pipe, whereby a passage from end to (No model.)

end of the cylinder is provided within the cylinder itself and all valves and pac'kings are readily accessible.

In the accompanying drawings, which form part of this specification, Figure 1 represents an elevation of a pump, partly in section, em-

bodying my present invention. Fig. 2 is a side view of part of Fig. 1, showing the joint in in; let-pipe in section on the linexar, Fig. 1. Fig. 3 is an enlarged section, on the line :1 y, of parts of the pump shown in Fig. 1.

In all the figures similar letters refer to simi lar parts.

A is the pump barrel or cylinder, secured to the casting by a screw -thread, as shown, or by bolts, as preferred, and provided with an inward flange at the lower end to sustain the foot-valve.

B is the discharging-chamber, and in the drawings forms also the guides for the crosshead 0. It is secured to the uprightD by bolts E E.

Fisthe pump-plunger or piston-rod, secured to the cross-head G, which is moved back and usual way. This pump-plunger I make of such diameter that its cross-section area shall be one-half that of the cylinder in which it works.

Gr is a bushing fitting in the dischargingchamber and-forming a seat for the cup-packing E. This packing is held in place by the ring J, which is perforated to allow the passage of-the fluid to the discharge-pipe K. The ringJ is held'in place by the upper end of the cylinder A, on which it rests. The cylinderA screws into the discharging-chamber B, and is packed, to prevent the escape of fluid, by the packing L.

On the lower end of the plunger F is secured the piston M, which also carries the check valve N. On top of the piston is the packing 0, held between the piston M and an enlargement on the lower end of the plunger F, which has passages through it at a a for the fluid to pass through.

I? is the check-valve case, secured to the inlet-pipe R. S is a cap screwed to the case P, and serves to hold the packing T in place and also to limit the upward motion of the footvalve U.

The inlet-pipe R and its outer support may .forth by a crank and connecting-rod in the be made sutfici'ently rigid and strong to sustain the fluid-pressure on the inside of the cylinder A, in which case the inward flange on this cylinder may be dispensed with.

To examine the packings and valves, the pump-cylinder A is unscrewed from the discharging-chamber B, and then passed over the inlet-pipeRuntil it rests on a shoulderforined on thejoint V of the inlet-pipe, thus telescoping the cylinder and the inlet-pipe. In this position the cap S can be removed and both the packing T and the foot-valve U taken out for examination and repair. The packing O and check-valve in the piston can also be removed at the same time by unscrewing the piston M. It the packingH needs renewal, the cylinder A can be swung sidewise, as shown by the broken lines at A, by means of the swivel-joint V, forming the outer support of theinlet-pipe, and the plunger F can then be unscrewed from the cross-head and withdrawn, leaving the packing H free. It will be evident that all of the interior parts of the pump can thus be examined and repaired or replaced without disturbing any of the connections of the-pressure or discharging pipe K, or breaking any joint, excepting that be tween the cylinder and the discharging-chamber, which is formed so as to be packed by the water-pressure.

Having now described my invenliomwhat I claim as new, and desire to secure by Letters Patent, is-

1. The combination of a fixed dischargechamber, a pump-barrel detachably connected thereto and supported thereby, a valved piston, a piston-rod having half the cross sectional area of the piston, and a valved inletpipe connected by a telescopic joint to the working-barrel, substantially as described.

2. The combination of a fixed dischargechamber,a pump-barrel detachably connected thereto and supported thereby, a valved piston, a piston-rod having half the cross'sectional area of the piston, and a valved and pivoted inlet-pipe connected by a telescopic joint to the working-barrel, substantially as described.

' WM. SELLERS. Witnesses:

GHAs. M. lVIILLER,

D. BRITTAIN ELY. 

